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SUMMARY:Sampling based on local signal analysis: applications to photo-rea
 listic imagery and beyond - Kartic Subr
DTSTART:20120322T103000Z
DTEND:20120322T113000Z
UID:TALK37103@talks.cam.ac.uk
CONTACT:Microsoft Research Cambridge Talks Admins
DESCRIPTION:The synthesis of photo-realistic visuals of virtual environmen
 ts entails simulation of the physics of light up to the tolerance of human
  perception. The inputs to this simulation are typically discrete approxim
 ations of inherently continuous signals such as 3D geometry and 6D materia
 l reflectance distributions. The output of the simulation is generally a l
 ight-field\, or more commonly video or images (slices of the light-field).
  The analysis and exploitation of structure in these multidimensional sign
 als is key for efficient discrete representation\, as well as tractable si
 mulation. In particular\, two fundamental types of sampling problems are e
 ncountered during physically-based image synthesis: sampling for reconstru
 ction and sampling for integration. The exploitation of local signal struc
 ture is crucial for both sampling problems.\n\nI will begin my talk by pro
 viding a broad overview of photo-realistic depiction\, along with my obser
 vations of the related trends and challenges. I will then place a few of m
 y existing work within a broad view of the space of solutions. Next\, I wi
 ll introduce the notion of local light-fields and describe how their frequ
 ency domain analysis reveals invaluable information that may be utilised f
 or efficient simulation of defocus due to finite-aperture cameras. I will 
 then briefly mention current work (under review) on generalising this anal
 ysis and its extension to motion blur due to finite-exposure cameras. Fina
 lly\, I will explain the shortcomings of such frequency-domain analysis an
 d propose a new approach --- local extremal theory for multidimensional si
 gnal analysis. I will speculate\, with the help of examples\, that knowled
 ge of such local signal structure would be useful in applications beyond p
 hoto-realistic depiction --- for example\, light-field acquisition.\n
LOCATION:Large lecture theatre\, Microsoft Research Ltd\, 7 J J Thomson Av
 enue (Off Madingley Road)\, Cambridge
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